Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2b3b3b708023c9…

MALICIOUS

PDF

86.1 KB Created: 2021-06-29 23:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3414478644ad405f414abe9ddbb5ce5e SHA-1: 4319d93652398df4ce1e4e7af9c0cf6c42f52a9f SHA-256: 3f2b3b3b708023c9233bfda98f633688bc328055add2fe5b9666ffeb7b93e9a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories, suggesting it functions as a link farm or redirector to malicious sites. The PDF's structure and embedded links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ulmtsg796ljnb4kvjsdacj2vcv/newotozizefipako.pdf In PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/7d869da3fef9354c170fbeefd05ffe78/nosuwakebofiroxaviwokur.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/zolozutom.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/daxavuson.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210623205245.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/54c25ac81ee4b8cbdcc7ce2768f860e4/19759350548.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/m8h40r8dpi97m05lr5lct6vaa5/93800099613.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/gjjs7s3ai132rt539jnumo45q7/96602501780.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/difugejagigewux.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/3dliuiuiersfrjj94ha4dj2lhl/79332206559.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/sozukawaxuzuw.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/lj397shvuu6f00jna8c3fhq5tc/wabomofadelopamej.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/jofijerevemajonunotitipeb.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/93740501609.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce22ba4565---zexazarizajo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c4618a470---55787702946.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099043811dd7---36508635357.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/a6d421ekdbai7fko0aqt3553rb/kirevutumi.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f108c540c---satagax.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/26fe1b19e705fd7b3d98fa3433860a39/dufazurujeremunitatadiwoz.pdfIn PDF document text
    • http://446888.top/userfiles/file/wawiwewotedew.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1c491e798---kesimevefizapagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pokemon+fire+red+gamesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 10644 bytes
SHA-256: 2eac312d6c840954d8f627987f25d14fc6d8115b0f9c2e603e400d1d80f505b9
font_01_sfnt_off000103c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 18484 bytes
SHA-256: 1363e4d23657ede8c1e475247efbda53d3f16d664d2577c10a8192b79f9f7556
font_02_sfnt_off00013393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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